Since your blood work by oncologist has been normal and a recent mammogram too was clear; the most likely cause of your symptoms is pinched nerves in neck which cause radiculopathy symptoms in arm (upper limb), chest and breast region. This can cause numbness and abnormal sensation (termed paresthesias). The pinched nerves can be due to;
1) Herniated/degenerated disc in neck
2) Cervical spondylosis; bone spurs in the neck vertebrae pressing on the nerves.
Following investigations would be required;
1) X-ray of the neck spine
2) MRI of the neck
3) Nerve conduction velocity (NCV) study
4) Electromyography (EMG)
Following measures would be helpful;
1) Neck care in the activities of daily living.
a) No working on computer for more than half an hour in a single stretch. Same for TV.
b) Monitors and televisions exactly in front (180 degrees).
c) Contour pillow: Should fill the hollow when lying on back or straight. Available over the counter.
2) Cervical Collar or Brace
3) Cervical traction
4) Anti-inflammatory analgesics like Ibuprofen
5) Some physicians do give oral steroids in severe radiculopathy cases, in whom paresthesias / numbness / tingling is quite significant.
6) Physical therapy: gradually increasing exercises from passive stretching to active against resistance regime.
7) Electrotherapy in the form of TENS, interferential and laser and ultrasound.
You can consult following specialists;
c) MD in Physical medicine and rehabilitation
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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